Creating tree view dynamically according to json text in Winforms

Question

I am building an application that gets in run-time JSON message from external source.

I don\'t know anything about the structure of the message text.

I want

Answer 1

You can try this code :

public class JsonTag
{
    public JsonTag(JsonReader reader)
    {
        TokenType = reader.TokenType;
        Value = reader.Value;
        ValueType = reader.ValueType;
    }

    public JsonToken TokenType { get; set; }
    public object Value { get; set; }
    public Type ValueType { get; set; }
}
private void JsonToTreeview(string json)
{
    tvwValue.BeginUpdate();
    var parentText = string.Empty;

    TreeNodeCollection parentNodes = tvwValue.Nodes;
    TreeNode current = null;
    tvwValue.Nodes.Clear();
    var reader = new JsonTextReader(new StringReader(json));
    while (reader.Read())
    {
        switch (reader.TokenType)
        {
            case JsonToken.None:
                break;
            case JsonToken.StartObject:
                current = new TreeNode("{}") { Tag = new JsonTag(reader) };

                parentNodes.Add(current);
                parentNodes = current.Nodes;
                break;
            case JsonToken.StartArray:
                current = new TreeNode("[]") { Tag = new JsonTag(reader) };

                parentNodes.Add(current);

                if (current.PrevNode != null)
                {
                    if (((JsonTag)current.PrevNode.Tag).TokenType == JsonToken.PropertyName)
                        current.Parent.Text += "[]";

                    parentText = current.Parent.Text;
                    if (current.Parent.Parent.Text.Length > 2)
                        parentText = ", " + parentText;
                    current.Parent.Parent.Text = current.Parent.Parent.Text.Insert(current.Parent.Parent.Text.Length - 1, parentText);
                }

                parentNodes = current.Nodes;
                break;
            case JsonToken.StartConstructor:
                break;
            case JsonToken.PropertyName:
                current = new TreeNode("\"" + reader.Value + "\" : ");
                parentNodes.Add(current);

                if (current.PrevNode != null)
                    current.PrevNode.Text += ",";

                parentNodes = current.Nodes;
                current = new TreeNode(reader.Value.ToString()) { Tag = new JsonTag(reader) };
                parentNodes.Add(current);

                break;
            case JsonToken.Comment:
                break;
            case JsonToken.Raw:
                break;
            case JsonToken.Date:
            case JsonToken.Integer:
            case JsonToken.Float:
            case JsonToken.Boolean:
            case JsonToken.String:
                var readerValue = "";
                if (reader.TokenType == JsonToken.String)
                    readerValue = "\"" + reader.Value + "\"";
                else
                    readerValue = reader.Value.ToString();

                current = new TreeNode(readerValue) { Tag = new JsonTag(reader) };
                parentNodes.Add(current);

                current.Parent.Text += readerValue;

                parentText = current.Parent.Text;
                if (current.Parent.Parent.Text.Length > 2)
                    parentText = ", " + parentText;
                current.Parent.Parent.Text = current.Parent.Parent.Text.Insert(current.Parent.Parent.Text.Length - 1, parentText);

                if (((JsonTag)current.PrevNode.Tag).TokenType == JsonToken.PropertyName)
                    current = current.Parent;
                current = current.Parent;
                parentNodes = current.Nodes;
                break;
            case JsonToken.Bytes:
                break;
            case JsonToken.Null:
                break;
            case JsonToken.Undefined:
                break;
            case JsonToken.EndObject:
                if (current.FirstNode.Tag != null &&
                    ((JsonTag)current.FirstNode.Tag).TokenType == JsonToken.PropertyName)
                    current = current.Parent;
                current = current.Parent;
                if (current == null)
                    parentNodes = tvwValue.Nodes;
                else
                    parentNodes = current.Nodes;
                break;
            case JsonToken.EndArray:
                if (((JsonTag)current.PrevNode.Tag).TokenType == JsonToken.PropertyName)
                    current = current.Parent;
                current = current.Parent;
                if (current == null)
                    parentNodes = tvwValue.Nodes;
                else
                    parentNodes = current.Nodes;
                break;
            case JsonToken.EndConstructor:
                break;
            default:
                throw new ArgumentOutOfRangeException();
        }
    }
    tvwValue.EndUpdate();
}